Accumulated Other Comprehensive Income - Changes in AOCI (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2021	Mar. 31, 2020
Changes in AOCI by component
Beginning balance	$ 43,993	$ 50,932
OCI before reclassifications	(2,403)	(15,048)
Amounts reclassified from AOCI	64
Net period OCI	(2,339)	(15,048)
Ending balance	41,654	35,884
Cumulative Unrealized Gain (Loss) on Available-for-Sale Securities
Changes in AOCI by component
Beginning balance	44,057	50,996
OCI before reclassifications	(2,403)	(15,048)
Net period OCI	(2,403)	(15,048)
Ending balance	41,654	35,948
Foreign Currency Translation
Changes in AOCI by component
Beginning balance	(64)	(64)
Amounts reclassified from AOCI	64
Net period OCI	$ 64
Ending balance		$ (64)

- Definition

Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

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